Question

solve the question in this image

Answer 1

Answer:

1 b is the answer

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Answer 2

Answer:17(i)-(b), (ii)-(a), (iii)-(b), (iv)-(d), (v)-(b)

Step-by-step explanation:

17 (i) Cloth material required = 2X surface area of hemispherical dome = 2 x 2×pi×r = 2 x 2x 22/7 x (2.5)2 = 78.57 m2

(ii) Volume of a cylindrical pillar = pi×(r)2×h

(iii) Lateral surface area = 2x 2×pi×r×h = 4 x22/7 x 1.4 x 7 = 123.2 m2

(iv) Volume of hemisphere =2/3×pi×r3=2/3×22/7×(3.5)3 = 89.83 m3

(v) Sum of the volumes of two hemispheres of radius 1cm each= 2 x 2/3×pi×(1)3

Volume of sphere of radius 2cm = 4/3×pi×(2)3

So, required ratio is = 2×2/3×pi×(1)3÷4/3×pi×(2)3

=2×2/3×22/7 ÷ 4/3×22/7×8

= 4/3 ÷ 32/3= 4/3 × 3/32

= 1/8

= 1:8

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